JPH08240507A - Apparatus for detecting leak of piping - Google Patents

Abstract

PURPOSE: To quantitatively detect and inform the integral leaking amount. CONSTITUTION: A gas flow rate-detecting means 6 for detecting a flow rate of gas, a leaking amount-detecting means 7 which outputs a signal when a signal from the detecting means 6 compared with a first reference value is smaller than the first reference value, and a integrating means 8 which integrates the gas flow rate from the detecting means 6 while the detecting means 7 outputs the signal are provided. The apparatus is also provided with a comparing means 9 which compares an integrated value at the integrating means 8 with a second reference value and outputs a signal when the integrated value is larger, and an informing means 10 for receiving the signal from the comparing means 9 and informing the fact.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe leakage detecting device for automatically detecting the presence or absence of gas leakage in a gas supply pipe.

[0002]

2. Description of the Related Art As shown in FIG. 8, a conventional inner pipe leakage inspection apparatus includes a flow rate sensor 2 for outputting a flow rate signal according to the amount of passing gas of a gas meter 1 provided in the middle of a gas flow path, and a flow rate signal. The inspection circuit 3 that receives the notification signal and outputs the notification signal and the alarm 4 that outputs the notification signal by the inspection circuit 3 are reset, and the inspection circuit 3 is reset by the flow rate signal and the flow rate signal is not input for the first set time or longer. A first timer that outputs a reset signal, a second timer that outputs the notification ON signal when the reset signal is input and the reset signal is not input for a second set time or longer, and the notification ON from the second timer An alarm drive circuit that receives a signal and outputs the signal to the alarm 4 (Japanese Patent Publication No. 2-42).
No. 185).

When the interval of the flow rate signal from the flow rate sensor 2 is longer than the set time of the first timer, the inner pipe leakage inspection apparatus regards the gas amount passing through the gas meter as substantially zero and sets the second timer. Reset signal is output to
Reset the second timer. If the interval of the flow rate signal from the flow rate sensor 2 is shorter than the set time of the first timer, the reset signal is not output and the second timer is not reset. When such a state continues for the inspection time of the second timer, even during the inspection time of the second timer,
The amount of gas passing through the gas meter did not become zero, that is, there is leakage, and an alarm ON signal is output to drive the alarm.

[0004]

However, in the above-mentioned conventional configuration, it is determined that there is a leak even if the period when the gas flow rate does not become zero continues for the inspection time of the second timer regardless of the absolute amount of the gas flow rate. Due to the configuration, there is a problem that the amount of leakage, which is a problem at the time of explosion due to gas leakage, cannot be accurately determined.

The present invention has been made to solve the above-mentioned problems, and it is a first object of the present invention to provide a pipe leakage detection device capable of judging the amount of leakage by integrating the gas flow rate judged to be the leakage level. It is a thing.

A second object is to output a preliminary warning of the amount of leakage. Further, the third purpose is to exclude the igniting of the gas appliances that burns continuously from the cumulative leak amount.

Further, after it is once determined that a gas leakage has occurred, the fourth object is to continue the integration of the leakage amount even when the gas appliance is burning until it is determined that the gas flow rate is zero, that is, there is no leakage. It is what

A fifth object is to reset the leak integrated value to zero when it is judged that the gas flow rate is zero.

[0009]

In order to achieve the above first object, the present invention provides a gas flow rate detecting means for detecting the flow rate of gas supplied from a gas supply means and a signal from the gas flow rate detecting means. The leakage amount determining means that outputs a signal when the signal is smaller than the reference value of 1, and the leakage amount that integrates the gas flow rate from the gas flow rate detecting means when the signal is output from the leakage amount determining means An integrating means, a leak amount comparing means for comparing the integrated value of the leak amount integrating means with a second reference value and outputting a signal when the integrated value becomes large; and a signal from the leak amount comparing means for receiving the signal. A notification means is provided to notify a remote place by information transmission by communication, to notify by a display, or to give a warning by an alarm sound.

In order to achieve the second object of the present invention, the second reference value has a plurality of values, and when the integrated value in the leakage amount integrating means exceeds each of the above reference values, A leak amount comparing means for outputting a signal including identification information according to the reference value is provided.

Further, in order to achieve the third object, the present invention includes igniter registration detecting means for registering igniter flow rate information of a gas appliance in use which is installed on the downstream side, using the signal of the gas flow rate detecting means as basic information. In addition, a leak amount integrating means is provided that does not add up the corresponding igniter flow rate when registering the igniter flow rate.

In order to achieve the fourth object of the present invention, a gas flow rate zero discriminating means for discriminating whether or not the signal from the gas flow rate detecting means is zero and outputting a signal when the signal is zero,
A leak amount determining means for comparing a signal from the gas flow rate detecting means with a first reference value and outputting a signal when the flow rate signal is smaller, and the gas from the time when the signal from the leak amount determining means is output. Until the time when the signal from the zero flow rate determination means is output, even if the gas flow rate signal of the gas flow rate detection means exceeds the first reference value, the leakage amount integration means for adding the leakage amount equivalent to The accumulated value in the quantity accumulating means is the second
And a leakage amount comparing means for outputting a signal when the integrated value becomes larger than that of the reference value.

Further, in order to achieve the fifth object, the present invention includes a leak integrated value zero reset means for resetting the integrated value of the leak amount integrating means to zero when the flow rate is zero according to a signal from the gas flow rate zero discriminating means. A means for determining the amount of leakage is provided.

[0014]

According to the present invention, when the signal from the gas flow rate detecting means is smaller than the first reference value, the leak amount determining means outputs a signal, and when the signal is output, the leak amount integrating means causes the leak amount integrating means to gas. Add up the flow rate. The leakage amount comparing means compares with the second reference value, judges that there is leakage when the integrated value becomes large, and outputs a signal. The notification means receives the signal from the leakage amount comparison means and notifies the remote location by information transmission through communication, or notifies by a display, or gives a warning sound.

Further, according to the present invention, the leakage amount comparing means includes the identification information corresponding to each reference value when the leakage amount comparing means compares the leakage integrated value with a plurality of second reference values and exceeds each reference value. Output a signal.

Further, according to the present invention, the leakage amount integrating means includes igniting registration detecting means for registering igniting flow rate information of the gas appliance in use installed on the downstream side using the signal of the gas flow rate detecting means as basic information. When registering the flow rate, the corresponding igniter flow rate is not added.

Further, according to the present invention, the gas flow rate zero discriminating means discriminates whether or not the signal from the gas flow rate detecting means is zero and outputs the signal when the signal is zero. Then, the leakage amount integrating means sets the gas flow rate signal of the gas flow rate detecting means to the first reference value from the time when the signal from the leakage quantity determining means is output to the time when the signal from the zero gas flow rate determining means is output. Even if it exceeds the limit, the leakage amount is added. The leakage amount comparing means compares the integrated value of the leakage amount integrating means with a second reference value and outputs a signal when the integrated value becomes large.

Further, according to the present invention, the integrated leakage value zero reset means included in the leakage amount determination means resets the integrated value of the leakage amount integration means to zero when the flow rate is zero according to the signal from the gas flow rate zero determination means. To do.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, the pipe leakage detection device of the present invention uses a gas flow rate detection means 6 for detecting the flow rate of the gas supplied from the gas supply means 5 and a signal from the gas flow rate detection means 6 as a first signal. The gas flow rate from the leak amount determination means 7 that outputs a signal when the signal is smaller than the reference value and the gas flow rate detection means 6 when the signal is output from the leak amount determination means 7 is integrated. Leakage amount comparing means 8 and leak amount comparing means 9 which compares the integrated value in the leak amount integrating means 8 with a second reference value and outputs a signal when the integrated value becomes large It comprises 10 notifying means for receiving a signal from the means 9 and for notifying to a remote place by information transmission by communication, notifying by display or warning by an alarm sound. 11 is a gas combustion appliance.

The operation of the above configuration will be described. The leakage amount determination means 7 outputs a signal when the signal from the gas flow rate detection means 6 is smaller than the first reference value. When the signal is output, the leakage amount integrating means 8 integrates the gas flow rate equal to or lower than the first reference value. The leakage amount comparing means 9 compares with the second reference value, and when the integrated value integrated by the leakage amount integrating means 8 becomes larger than the second reference value, it is judged as leakage and outputs a signal. The notification means 10 receives the signal from the leakage amount comparison means 9, and transmits information to a remote place by communication.
Alternatively, it is notified by a display, or a warning is given by an alarm sound.

The change state of the gas flow rate and the output state of each signal are shown in the timing chart of FIG. The horizontal axis is the elapsed time,
The vertical axis represents (a) the gas flow rate detected by the gas flow rate detection means 6, (b) the output signal of the leakage amount determination means 7, (c) the integrated value of the leakage amount integration means 8, and (d). Indicates the output signal of the leakage amount comparison means 9. Up to the elapsed time t1, the gas flow rate is zero as shown in (a), and since it is smaller than the first reference value, the output signal of the leakage amount discriminating means 7 in (b) outputs a high level. From the elapsed time t1 to t2, the gas flow rate exceeds the first reference value as shown in (a), and the low level is output in (b). Further, the elapsed time t2 to t3 is the same as the above t1, but the gas flow rate is smaller than the first reference value but not zero in the period from t3 to t4. Therefore, as shown in (b), the output signal of the leakage amount determining means 7 is at a high level, and it can be seen that the gas flow rate is being integrated by the leakage amount integrating means 8 as shown in (c). Next, during the period from t4 to t5, the gas flow rate is larger than the first reference value, so the leakage amount integrating means 8 does not integrate the gas flow rate, and holds the integrated value at the time point t4. Further, after t5, there is a gas flow rate that is not zero but smaller than the first reference value, so the gas flow rate is integrated by the leakage amount integration means 8,
It can be seen that the value exceeds the second reference value at t6. At time t6, the leakage amount comparison means 9 outputs a signal. In response to this output signal, the notification means 10 notifies that the integrated gas leakage amount has reached a predetermined level. Here, the first reference value of (a) indicates the minimum combustion amount of the gas combustion appliance, and is 50
It is about 0 (kcal / h). That is, 500 (kcal / h)
The presence of the following gas flow rates is judged as a leak not when a normal gas appliance is burning, and the amount is summed up. Also, the first to consider that ordinary gas appliances are burning
If the value exceeds the reference value of, the leakage amount integration is suspended. By the way, in the period up to t1 and the period from t2 to t3, the leak amount integrating means 8 performs the integrating operation according to the output signal of the leak amount determining means 7, but the integrated value increases because the gas flow rate is zero. I haven't.

As described above, according to the pipe leakage detection device of the present invention, the gas flow rate smaller than the first reference value is determined as the leakage level, integrated, and compared with the second reference value to continuously measure the total flow rate. The amount of leakage can be detected, and it becomes possible to issue a gas leakage warning under quantitative judgment before a gas explosion or other important event. In other words, under constant monitoring, by issuing a warning if there is a leak,
The safety of gas usage can be further secured.

FIG. 3 shows another embodiment and is a timing chart showing the changing state of the gas flow rate and the output state of each signal. The horizontal axis represents elapsed time, and the vertical axis (a) represents leakage amount integrating means 8.
(B) shows the output signal of the leakage amount comparison means 9. As shown in (a), the second reference value has two stages of 1 and 2, and the leakage amount comparison means 9 compares the leakage integration value with the plurality of second reference values. At the elapsed time t4, since the leakage amount integrated value has reached the second reference value 1, the leakage amount comparison signal is output. Further, at t5, the integrated value of the leakage amount is the second
Since the reference value 2 has been reached, the leakage amount comparison signal is also output here. Although not shown, the leakage amount comparison signal includes identification information according to the levels 1 and 2 of the second reference value.

According to this embodiment, it is possible to output a preliminary warning of the integrated amount of gas leakage by comparing with a plurality of second reference values, and it is possible to take measures against leakage promptly. In addition, the degree of gas leakage can be predicted from the passage of time when each alarm level is issued, which can be an effective material for urgent determination.

Although FIG. 3 shows an example of the second reference value in two stages, it is naturally possible that the leakage amount comparison means 9 has a plurality of levels higher than this and makes the determination. In addition, changing the warning level according to the leak amount detection target, that is, according to the capacity or structure of the building is also effective in preventing the gas explosion.

FIG. 4 shows another embodiment, in which the components having the same numbers as in FIG. 1 have the same functions. In the pipe leakage detection device of the present invention, the leakage amount integration means 8 has 12 ignition registration detection means for registering ignition flow information of the gas appliance 11 in use which is installed on the downstream side using the signal of the gas flow detection means 6 as basic information. In addition, when registering the igniter flow rate, the corresponding igniter flow rate is not integrated.

The change state of the gas flow rate and the output state of each signal according to the configuration of the other embodiment are shown in the timing chart of FIG. Similar to Fig. 2, the horizontal axis is elapsed time and the vertical axis is (a).
Is the gas flow rate, (b) is the leak amount determination signal, (c) is the leak amount integrated value, and (d) is the leak amount comparison signal. Until elapsed time t1
As shown in (a), the gas flow rate is the ignition flow rate information of the gas appliance, and since this flow rate is smaller than the first reference value, (b)
The output signal of the leakage amount determination means 7 of 1 outputs a high level. However, since the igniter flow registration amount is registered by the igniter registration detecting means 12, the gas flow rate corresponding to the igniter is not integrated by the leakage amount integrating means 8 as shown in (c).
After that, from the elapsed time t1 to t2, the gas flow rate exceeds the first reference value as shown in (a), and the low level is output in (b). Further, the elapsed time from t2 to t3 is the same as that from the above t1, but in the period from t3 to t4, the gas flow rate is smaller than the first reference value but larger than the ignition flow rate information amount. Therefore, as shown in (b), the output signal of the leakage amount determining means 7 is at a high level, and as shown in (c), the leakage amount integrating means 8 accumulates gas flow rates other than the igniting flow rate. I understand. Next, during the period from t4 to t5, since the gas flow rate is larger than the first reference value, the leakage amount integrating means 8 does not integrate the gas flow rate and holds the integrated value at the time point t4. Further, after t5, there is a gas flow rate that is equal to or higher than the igniting flow rate and smaller than the first reference value, so it can be seen that the gas flow rate is integrated by the leakage amount integrating means 8 and exceeds the second reference value at t6. At time t6, the leakage amount comparison means 9
Outputs a signal. Receiving the output signal, the notification means 10
Indicates that the cumulative amount of gas leakage has reached a predetermined level.

According to the configuration of this embodiment, if the fire is registered in the fire-fire registration detecting means 12, it is possible to exclude the fire that continuously burns the gas appliance from the leak amount integration. By adding up, there is an effect that no alarm is given.

FIG. 6 shows another embodiment, in which the components having the same numbers as in FIG. 1 have the same functions. The pipe leakage detection device of the present invention determines whether the signal from the gas flow rate detection means 6 is zero or not, and outputs a signal when the signal is zero. Even when the gas flow rate signal of the gas flow rate detection means 6 exceeds the first reference value from the time when the signal is output to the time when the signal from the zero gas flow rate determination means 13 is output, the leakage amount equivalent amount is added. The leak amount integrating means 8 is configured to move forward.

The change state of the gas flow rate and the output state of each signal according to the configuration of the other embodiment are shown in the timing chart of FIG. The horizontal axis is elapsed time, the vertical axis is (a) gas flow rate, (b)
Is the output signal of the zero gas flow rate determination means, (c) is the leakage amount determination signal, (d) is the leakage amount integrated value, and (e) is the leakage amount comparison signal.
Up to the elapsed time t1, the gas flow rate is zero as shown in (a), and the zero determination signal in (b) and the leakage amount determination signal in (c) output a high level state. Elapsed time t1 to t
Up to 2, the gas flow rate exceeds the first reference value as shown in (a), and a low level is output in (b) and (c). Further, the elapsed time t2 to t3 is the same as the above t1, but the gas flow rate is smaller than the first reference value but not zero in the period from t3 to t4. Therefore, (b)
The output signal of the gas flow rate zero discriminating means 13 is at a low level, as shown by, and the output signal of the leakage amount discriminating means 7, as shown at (c), is at a high level. Therefore, as shown in (d), it can be seen that the gas flow rate is being integrated by the leak amount integrating means 8. Next, during the period from t4 to t5, the gas flow rate is the first
Although it is larger than the reference value of, but before t3 to t4, only the signal from the leakage amount determination means 7 is output and the integration of the leakage amount is started. Therefore, the period from t4 to t5 is also t4. It can be seen that the gas flow rate determined to be a gas leak is considered to be equivalent to the leak amount and is added. Further t5
After that, since there is a gas flow rate that is not zero but smaller than the first reference value, it is understood that the gas flow rate is integrated by the leakage amount integrating means 8 and exceeds the second reference value at t6. The t
At time point 6, the leakage amount comparison means 9 outputs a signal. In response to this output signal, the notification means 10 notifies that the integrated gas leakage amount has reached a predetermined level. Further, at t7, the gas flow rate becomes zero and the output signal of the zero gas flow rate determination means 13 becomes high level, so the leakage amount integration means 8 suspends the integration.

According to the configuration of this embodiment, once it is determined that a gas leak has occurred, the leak amount integration is continued even when the gas appliance is burning until it is determined that the gas flow rate is zero, that is, no leak has occurred. Therefore, the effect of leak judgment is greatly improved for households for business use, etc., where the gas appliances are continuously used for a long time.

Further, in another embodiment, there is provided a leak integrated value zero reset means for resetting the integrated value of the leak amount integrating means 8 to zero when the flow rate is zero according to a signal from the zero gas flow rate determining means 13.

With the above structure, the zero gas flow rate determining means 1 is provided.
When it is determined that the gas flow rate is zero according to 3, the integrated value of the integrated leak value zero resetting means is cleared to zero.

According to the structure of this embodiment, the gas flow amount corresponding to the leak is integrated by the leak amount integrating means 8 when the gas leak amount smaller than the first reference value is found. When the flow rate becomes zero, the accumulated value up to now is no longer necessary, so it is automatically reset and new detection / accumulation of gas leakage and comparison judgment can be performed. Although some gas appliance users do not register, they may leave the fire on for a long time, but even if this happens, if there is no leak when the fire is extinguished, the integrated value will be reset, so a false leak judgment will be greatly Can be suppressed.

By the way, by providing the leakage amount determining means including the varying means for varying the first reference value which is the leakage determination level, the gas is not limited to the gas flow rate range of 500 (kcal / h)) or less. Flow rate integration and comparison determination can be performed.

Further, a leak amount judging means for dividing the gas flow rate range below the first reference value into a plurality of flow rate ranges and outputting a signal including identification information when there is a signal in the corresponding flow rate range, Leakage amount integrating means for integrating the gas flow rate for each of the plurality of flow rate regions with a signal from the leak amount determining means, and leak amount comparing means for comparing the total integrated value of each flow rate region with a second reference value. With the provision, it is possible to estimate the leak location or range from the gas flow rate range corresponding to the leak.

Further, a leakage amount determining means including a leakage amount increasing tendency determining means for determining whether or not the signal from the gas flow rate detecting means having a first reference value or less is increasing, and the leakage amount increasing tendency determination. By providing the alerting means for issuing a warning when the signal indicating that there is an increasing tendency is output from the means, it is not necessary to wait until the integrated leak value exceeds the second reference value, and the leak alarm can be promptly issued.

[0039]

As described above, the pipe leakage detection device of the present invention has the following effects.

(1) The leakage amount integrating means integrates the gas flow rates below the first reference value, and the leakage amount comparing means creates the second integrated value.
Compared with the reference value of, when the former becomes larger than the latter, it is judged as leakage and a signal is output, so that the gas flow rate smaller than the first reference value is judged as the leakage level and integrated, and the second reference value is added. By comparing with the value, it is possible to detect the total amount of continuous leakage, and it is possible to issue a gas leakage warning under quantitative judgment before a gas explosion or other important matter occurs. In this way, by constantly monitoring the gas leakage, it is possible to further secure the safety of using the gas.

(2) A preliminary alarm can be output by comparing the integrated leak value with the second reference values of a plurality of levels, and it is possible to take a leak countermeasure promptly. Further, the degree of gas leakage can be predicted from the passage of time when each alarm level is issued, and it can be utilized as an effective material for urgent judgment.

(3) The leakage amount integrating means includes a igniter registration detecting means for registering the igniter flow rate information of the gas appliance in use which is installed on the downstream side, using the signal of the gas flow rate detecting means as basic information,
When registering the igniter flow rate, the corresponding igniter flow rate is not added up.Therefore, if it is registered in the igniter registration detection means, it is possible to exclude the igniter that burns gas appliances continuously from the leak amount integration. Therefore, it is possible to provide a highly reliable pipe leakage detection device that does not erroneously add up as leakage.

(4) The gas flow rate signal of the gas flow rate detection means is the first from the time when the signal from the leakage amount determination means is output to the time when the signal from the zero gas flow rate determination means is output.
Even if it exceeds the reference value of, since the amount equivalent to the amount of leakage is added, once it is determined that a gas leakage has occurred, the gas appliance is burning until the gas flow rate is zero, that is, no leakage is determined. Even if it is in a state, the leak amount can be continuously accumulated, and a reliable leak judgment can be promptly made even for a business household or the like who has a long time to continuously use the gas appliance.

(5) The gas flow rate corresponding to the leak is integrated by the leak quantity integrating means from the time when the gas leak quantity smaller than the first reference value is found, but the leak flow measures are taken and the gas flow rate becomes zero. Sometimes the accumulated value up to now is automatically reset,
It is possible to newly detect and integrate gas leakage and make a comparative judgment. In addition, depending on the gas appliance user, there is a case where the fire is not registered but the fire is left on for a long time, and in this case as well, if there is no leak at the time of extinguishing the fire, the integrated value will be reset, so a leak misjudgment will be greatly Can be suppressed.

[Brief description of drawings]

FIG. 1 is a block diagram of a pipe leakage detection device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a change in gas flow rate and output of each signal of the pipe leakage detection device.

FIG. 3 is a diagram showing changes in gas flow rate and output of each signal in another embodiment of the present invention.

FIG. 4 is a block diagram of a pipe leakage detection device according to another embodiment of the present invention.

FIG. 5 is a diagram showing changes in gas flow rate and output of each signal in the other embodiment.

FIG. 6 is a block diagram of a pipe leakage detection device according to another embodiment of the present invention.

FIG. 7 is a diagram showing changes in gas flow rate and output of each signal in another embodiment.

FIG. 8 is a block diagram of a conventional inner pipe leakage inspection device.

[Explanation of symbols]

 6 Gas flow rate detection means 7 Leakage amount determination means 8 Leakage amount integration means 9 Leakage amount comparison means 10 Notification means 12 Pilot registration detection means 13 Gas flow rate zero determination means

Claims (5)

[Claims] 1. A gas flow rate detecting means for detecting a flow rate of gas supplied from a gas supply means, and a signal from the gas flow rate detecting means is compared with a first reference value, and a signal is output when the signal is smaller. The leakage amount determining means, the leakage amount integrating means for integrating the gas flow rate from the gas flow rate detecting means when the signal is output from the leakage amount determining means, and the integrated value in the leakage amount integrating means as the second reference. A leak amount comparison means for outputting a signal when the integrated value becomes larger than the value, and a signal from the leak amount comparison means for notifying to a remote place by information transmission by communication or notifying by a display or warning A pipe leakage detection device, comprising a notification means for giving a warning by sound. 2. The second reference value has a plurality of values, and outputs a signal including identification information corresponding to each reference value when the integrated value in the leakage amount integrating means exceeds each of the reference values. The pipe leak detection device according to claim 1, further comprising: 3. A igniter registration detecting means for registering igniter flow rate information of a used gas appliance installed on the downstream side by using a signal of the gas flow rate detecting means as basic information, and when the igniter flow rate is registered, the corresponding igniter flow rate portion is not integrated. The pipe leakage detection device according to claim 1 or 2, further comprising a leakage amount integrating means. 4. A gas flow rate detection means for detecting a flow rate of gas supplied from a gas supply means, and a gas flow rate zero determination for determining whether or not a signal from the gas flow rate detection means is zero and outputting a signal when the signal is zero. Means for comparing the signal from the gas flow rate detection means with a first reference value and outputting a signal when the flow rate signal is smaller, and a time point at which the signal from the leakage quantity determination means is output. To the time point at which the signal from the zero gas flow rate determining means is output, the leak rate integrating means adds the leak rate equivalent amount even when the gas flow rate signal of the gas flow rate detecting means exceeds the first reference value. And a leakage amount comparing means for comparing the integrated value of the leakage amount integrating means with a second reference value and outputting a signal when the integrated value becomes large,
A pipe leakage detection device, comprising: a notification unit that issues a warning upon receiving a signal from a leakage amount comparison unit. 5. A leak integrated value zero reset means for resetting the integrated value of the leak amount integrating means to zero when the flow rate is zero according to a signal from the zero gas flow rate determining means.
The pipe leakage detection device according to 2 or 4.